10 Real Reasons to Lose 10 Pounds

Flab's a drag. Literally. For every pound of fat you lose, you run up to 4 seconds faster per mile; with 10 gone, that's up to 40 seconds off your mile time, says Paul Vanderburgh, Ed.D., an exercise physiologist at the University of Dayton. "Your body won't have to work as hard to go forward."